It looks like you hit the rather strange text bug. It seems that on some occasions when the geometry that a text label is attached to gets deleted, the text flies off to infinity. Nobody has yet been able to reproduce it consitently.

I think I’ve found a way to reproduce it consistently!

Start with a blank model

Draw a rectangle

Draw a line on a diagonal, dividing the rectangle into two faces

Attach text to each face. Be sure you’re attaching to the face, not one of the edges.

Delete the line you created in step 3

Now examine your model. One of the two texts you attached is visible. Now zoom extents. Voila - problem appears, reproducibly (at least for me).

I suspect that the other text, the one no longer visible, still exists in the model at an either undefined or ridiculous location. I’m sure someone with Ruby experience can post a bit of code we can all paste into our Ruby Consoles to confirm its invalid location.

Edit: I hereby retract one claim I made above: that I discovered this method of reproducing the error! There was a thread which revealed the behavior - reproducibly, but I can’t recall the thread. What I think I’ve done is reduce the example to its simplest form.

Yes, you can reproduce this behavior by drawing a rectangle, add a label text on the face, draw a line to divide the face and then erase that line. The attached label sometimes disappears, sometimes it will 'fall 'just next to the face. Applying a zoom extends will expose difficulties in navigating.
[labelbug]